Vessel superstructure



A. McDOUGALL.

VESSEL 'SUPERSTRUCTURE. APPLICATION. FILED OCT. 18. 1919.

Patented May 31,1921.

ATTORNEY.

c T all whom it may concern:

ALEXAN ER MenoUcrALL, or DULUTH, fiI1\Tl\T QS O IA;

i':VESSEL sornns'rnno'runn. T

Be it known that I, ALEXANDER MoDoU- GALL, a citizen of the UnitedStates, residing at Duluth, in the county of St. Louis and State ofMinnesota, have invented certain new useful Improvements in VesselSuperstructures, of which the following is a specification, referencebeing had therein to the accompanying drawing.

The invention'rel tes to'vessels and-has q special reference to a vesseladapted to the carrying of bulk oil or common freight as desired. I

-The principal sel of this character which may be employed in. eitherform of such service with as little inconvenience as possible, it beingwell known that tank vessels used in the oil business are not commonlyemployed in the carrying of any other form of freight. 7

Other objects and advantages of the peculiar means by. which Iaccomplish such conveniently convertible vessel will appear in thefurther description of the invention. In the accompanying drawingformlng partof this application and in which like reference charactersrepresent like parts: Figure l is a side elevation of a flush deckself-propelled vessel embodying my invention. I

2 is a top plan view of same. 4 v I I Fig. 3 is a transverse sectionalview 1 through the hatch coaming of the vessel.

Fig. 4 is a transverse sectional view of the hull of a vessel throughoneiof the hatchways therein, illustrating two embodiments of theinvention.

Fig. 5 is a similar view to Fig. 4c of a vessel having an upwardlyextending trunk hatch coaming longitudinally the main deck vessel whichare employed for other pur-' poses. These bulkheads are indicated at 1and 2 in the drawings and which are no de-.

parture from those commonly used.

The holds of such vessels are also commonly divided into smallcompartments object is to provide a vesmade by numerous bulkheads,thwartships and fore and aft-,so as to confine the oil in Specificationof Letters Patent; Application fileaoetoberis, 11919. 1S erialNo,331,606.- i i i i small 'spaces to keep fit under control inthe event ofthe ship laboring ill-rough weather.

Over each of such compartments is lo-. cated an expansion tankorrelafti-vely smaller compartmentto allow for the expansion of the oil'and'the 'carrying' ofi. of gasses arising from-samedue' to itsactionwithin'the compartments.

9. 100p. bf thev expansiontanks are mounted pipesand valve connecv tionsfor both filling and-emptying the com-: partments as well as providingthe necessaryrelief therefor, andsuitable manholes are also providedwithin the tanks for 'accessto the compartments. In exclus ve Oilcarrying. boats these tanks are made fixtures to" the deck or built upas parts of thevessel, such tank vessels having. no prov s on. for;carrying other formsof cargo, such as hatches or the like and areconfined strictly to thejone form of cargo which naturally results in;their being able to 'carryacargo inbut onedirectionj only.

-, so Now in myimproved structure ITprovide: theusual numberof largehatches common" to theordinary freight carrying vessel and prefer toform such hatches with "a low flat coaming indicated at 3 fixed to thedeck 40f the vessel with preferably a. single plate '5,* though twoseparate plates and expansionv tanksfimay be used if preferred, at-eachhatch space.

hatch and the hatch lcover'is, securely ibolted Theupper face of the'c'oammg 3 1s inclined slightly away from-the to the coaming asclearly'indicated 'inFigz if I 3 there being rubber or other forms ofgasket employed intermediate of the cover and coaming to insure waterand oil tight connection therewith.

By this form of hatch and coaming it is evident that the deck of thevessel can be made equally as strong and secure as if Iijo hatches wereformed therein and such hatch covers may be quickly removed by takingout of the bolts 6 and sliding or lifting themto a position intermediateof the hatches as illustrated in one instance in Fig. 6 of the drawings.v

On top of the hatch plates 5 are permanently attached the rectangularshaped expansion tanks or compartments illustrated at 7 theycorresponding in size and necessary equipment to those previouslyreferred toas employed in theordinary tank ship,

the equipment usually consisting of a relief valve and pipe indicated at8, manholes indicated at 9, and other pipe connections such as forfilling and emptying the tanks or for heating purposes, illustrated at10.

Such vessel may be provided with a double bottom or not as desired andwhen constructed with a double bottom, the tank below can be used foroil cargo space, water" ballast or for fuel oil for the vessel as.preferred.

Some oil carrying vessels are equipped with a fixed upwardly extendingtrunk hatch coaming asillustrated at 11 in Fig. 5 and in suchconstruction the hatches would be formed transverse the top of the trunkand the hatch covers 5 carrying the expansion tanks 7 bemoved fore andaft when desired in thesame manner as when located directly upon thedeck of the vessel. 7 I

Some compartments in the vessel may be fitted to carry liquid cargo forwhich no expansion tank is necessary or such compartments may not beentirely filled, in which event the manholes and pipe fittings would belocated directly upon the hatch plates 5 as indicated at 12 Figs. 1 and4 and-which may be inclosed within a small deck house illustrated at 13securely fixed to the hatch plate. 7 This house being a fixture upon'thehatch cover would be moved fore-and aft with it when the latter ismanipulated and such modification without the deck house might beespecially desirable in'the vessel having a continuous trunkhatch'and'in which the latter is used as expansion tanks for all of thecompartments.

While the invention is illustrated as ap plied'to a substantiallyrectangular shaped ship the samemay be employed with equal advantage tothe common type of vessel.

From the foregoing it is evident that l have devised simple andcomparatively inexpensive means whereby the usefulness of avesselparticularly designed for the carrying of bulk liquid cargo may besubstantially doubled and one which may be used in the transporting ofother forms of freight with but little change in its equipment and thenovel combination of hatch cover with the accompanying parts fixedthereto may he slid or raised and lowered as required with but littlemore difiiculty than the hatch covers without such equipment.

Having thus described my invention, what I claim as new and-desire tosecure by Letters compartments therein for carrying bulk oil cargo, ofhatchways through the upper deck of the vessel communicating with all ofthe compartments, large fiat covers for the hatchways and expansiontanks carried by the covers whereby the vessel may readily {oe usied forcarrying cargo other than bulk iqui 3. A double purpose vessel of thecharacter described comprising in combination a plurality of verticallyseparated cargo compartments, hatches in the" upper deck of the vesselcommunicating with all of the compartments, large fiat covers for thehatches and expansion tanks for the compartments carried by the hatchcovers.

In testimony whereof I hereuntov affix my signature in the presence oftwo witnesses.

ALEXANDER MODOUGALL.

Witnesses W. H. DENHAM, S. GEO. STEVENS.

